“Nuclear innovation for a carbon-free future”
- Founding: 2006
- HQ: Bellevue, WA
- Market: Energy / Advanced Nuclear
- Total Funding: ~$1.4B private (plus ~$2B DOE cost-share support)
- Funding Stage: Late-stage private
- No. of Employees: ~900–1,000
Our firm prepares detailed research reports and investment memos for select private company opportunities. Going beyond our public materials, these reports provide comprehensive analysis including the investment thesis, market and competitive assessment, proprietary alternative data, risks and mitigants, and financial base, bear, and bull scenarios. Our research surfaces key insights to help enable informed investment decisions. The content on this page is provided for educational purposes only and is not an endorsement, sponsorship, affiliation, or investment recommendation of TerraPower.
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The world needs vastly more clean, reliable electricity — and the surge in AI data center demand has turned that need urgent. TerraPower, the advanced nuclear company founded in 2006 and chaired by Bill Gates, was built to meet it. The company is developing the Natrium reactor: a 345-megawatt sodium-cooled fast reactor paired with a gigawatt-scale molten-salt energy storage system, designed to deliver steady carbon-free power and ramp output to match demand. In March 2026, TerraPower received a construction permit from the U.S. Nuclear Regulatory Commission for its first commercial Natrium plant in Kemmerer, Wyoming — the first such permit for a commercial advanced reactor of its kind — having already raised roughly $1.4 billion in private capital, including a $650 million round in 2025 that drew in Nvidia’s venture arm alongside Bill Gates and HD Hyundai.
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Investing in TerraPower — What You Need to Know in 2026
Overview
- TerraPower’s Founding
- What TerraPower Does: Core Products and Services
- How TerraPower Makes Money: The Business Model
- TerraPower’s 2026 Valuation
- Why Consider Investing in TerraPower
- Risks Associated with Investing in TerraPower
- The Future Outlook of TerraPower
- Frequently Asked Questions
- How Can I Invest In TerraPower?
- Is TerraPower Publicly Traded?
- How Can I Buy TerraPower Stock?
- Is It Possible To Invest In TerraPower Through ETFs or Mutual Funds?
Key Highlights
- In March 2026, TerraPower received a construction permit from the U.S. Nuclear Regulatory Commission for its first commercial Natrium reactor in Kemmerer, Wyoming — a landmark regulatory milestone and, per the company, the first NRC construction permit for a commercial advanced (non-light-water) reactor. TerraPower had submitted its application in March 2024 and broke ground on non-nuclear construction at the site in 2024.
- In June 2025, TerraPower closed a $650 million fundraise that included Nvidia’s venture arm NVentures — its first energy investment — alongside existing backers Bill Gates and HD Hyundai. UBS acted as exclusive placement agent. The round brought total private financing to more than $1.4 billion; further terms were not disclosed and TerraPower remains privately held.
- TerraPower’s capital base is unusually deep for a private company because it is paired with substantial federal support. The company was selected for the U.S. Department of Energy’s Advanced Reactor Demonstration Program, with roughly $2 billion in cost-share support — giving the Natrium project more than $3.4 billion in combined private and public backing toward the first plant.
- The Natrium design pairs a 345-megawatt sodium-cooled fast reactor with a gigawatt-scale molten-salt energy storage system. The storage allows the plant to keep the reactor running at a steady state while varying electricity output to the grid — a feature that makes advanced nuclear far more compatible with renewable-heavy grids and with the around-the-clock demands of AI data centers.
- TerraPower may be positioned at the intersection of two powerful 2026 tailwinds: surging electricity demand from AI and data centers, and strong federal policy support for nuclear, including executive actions aimed at accelerating new reactor deployment. The company has explored co-locating reactors with data centers through a relationship with Sabey Data Centers.
TerraPower’s Founding
TerraPower was founded in 2006 by Bill Gates together with a group of scientists and technologists, growing out of work at the invention lab Intellectual Ventures. The original concept was the “traveling-wave reactor,” a design intended to run on depleted uranium and minimize waste. Over time the company’s commercial focus shifted to the Natrium reactor, a sodium-cooled fast reactor with integrated energy storage developed in collaboration with GE Hitachi Nuclear Energy.
Bill Gates remains chairman and is the company’s largest individual backer; Chris Levesque serves as President and CEO. The company is headquartered in Bellevue, Washington. TerraPower’s thesis from the start has been that innovation in nuclear science — safer designs, lower costs, streamlined construction, and integrated storage — can make advanced nuclear a practical, scalable source of carbon-free baseload power, rather than a perpetually delayed promise.
That thesis is now being tested in Kemmerer, Wyoming, where TerraPower is building its first commercial Natrium plant at the site of a retiring coal facility — a deliberate choice that lets the project tap existing grid infrastructure and a local energy workforce. Construction of non-nuclear components began in 2024, and the NRC granted the reactor construction permit in March 2026.
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What TerraPower Does: Core Products and Services
TerraPower is an advanced nuclear technology company. Rather than building conventional water-cooled reactors like those operating across the U.S. today, it is commercializing next-generation designs intended to be safer, more flexible, and ultimately cheaper to build. That last point is the whole investment case: conventional nuclear plants have become notoriously slow and expensive to build, which is the main reason almost no new ones get started in the U.S. If TerraPower can deliver a reactor that is cheaper and faster to construct — and that can vary its output to match demand rather than running flat-out — it would be selling exactly what an AI-driven, renewables-heavy grid is starving for: firm, carbon-free power that can actually be deployed at scale. Its work centers on three pieces that build toward that goal: a flagship reactor product (Natrium), an integrated energy-storage system that makes the reactor flexible, and a related nuclear fuel and isotopes business that supplies the specialized fuel these reactors need.
The Natrium Reactor
Natrium is TerraPower’s flagship product: a 345-megawatt sodium-cooled fast reactor. Instead of water, it uses liquid (molten) sodium as a coolant, which operates at lower pressure and higher temperature than conventional reactors — improving efficiency and, the company argues, safety. The reactor sits between today’s large gigawatt-scale plants and the smaller modular reactors other developers are pursuing, and is being developed with GE Hitachi Nuclear Energy.
Integrated Energy Storage
What distinguishes Natrium from most reactor designs is its gigawatt-scale molten-salt energy storage system. The reactor continuously heats sodium; when grid demand is low, excess heat is stored in large molten-salt tanks rather than throttling the reactor down. When demand rises, that stored heat drives steam turbines to boost output. Because nuclear plants do not easily ramp up and down, this storage layer is what lets Natrium follow demand instead of running flat-out — the flexibility the intro flagged, delivered in hardware.
Nuclear Fuel and Isotopes (HALEU and Medical Isotopes)
Advanced reactors like Natrium require high-assay low-enriched uranium (HALEU), a fuel that has historically been in short supply in the United States. TerraPower has worked to help develop a domestic HALEU supply chain. The company also has an isotopes business pursuing medical and industrial isotopes — a separate, nearer-term commercial line that leverages its nuclear expertise.
Why the Combination Matters for Investors
TerraPower is not selling a single piece of hardware; it is attempting to commercialize an integrated system — reactor, storage, fuel, and the regulatory and construction know-how to deploy it. If the first Kemmerer plant succeeds, the long-term value lies in repeatable deployment: building additional Natrium units in the U.S. and abroad, supplying fuel, and potentially co-locating reactors with large electricity consumers such as data centers. This is a long-duration, capital-intensive thesis with a correspondingly long path to potential revenue.
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How TerraPower Makes Money: The Business Model
TerraPower is a pre-revenue (from its core reactor) development-stage company, and its business model is best understood as a long-horizon infrastructure play rather than a near-term cash-generating business. Its current and prospective revenue and value drivers include:
- Reactor deployment and power sales. The long-term core of the business is building and operating (or partnering to operate) Natrium plants and selling the resulting electricity, or licensing/deploying the technology with partners and utilities. The first plant in Wyoming is the demonstration that must prove the model.
- Government cost-share and contracts. A substantial portion of the first plant’s funding comes from the U.S. Department of Energy’s Advanced Reactor Demonstration Program (roughly $2 billion in cost-share support), which de-risks the initial build but also ties timelines and economics to federal programs.
- Nuclear fuel (HALEU) and isotopes. TerraPower’s fuel and isotopes activities represent additional, potentially nearer-term commercial lines that draw on its nuclear capabilities.
- Strategic and data-center partnerships. Relationships such as the one explored with Sabey Data Centers point to a model in which advanced reactors are co-located with or dedicated to large electricity buyers — a structure increasingly attractive to hyperscalers seeking firm, carbon-free power.
Investors should understand clearly: TerraPower’s reactor revenue depends on completing construction, achieving regulatory operation, and demonstrating cost and schedule performance — milestones that may lie years in the future. The first Natrium plant is targeted to be operational around 2030. Until then, the company funds itself through private capital and federal support.
TerraPower’s 2026 Valuation
TerraPower has not publicly disclosed a post-money valuation. The company has stated that terms of its financings, including the 2025 round, were not disclosed, and it remains privately held. Available figures describe capital raised rather than a confirmed company valuation. Private-company shares are Level 3 “hard-to-value” assets, and any implied pricing may vary significantly across pre-IPO platforms, funding rounds, and fund marks. Investors should treat any specific valuation figure they encounter for TerraPower with caution unless it is confirmed by the company.
TerraPower’s funding has come in three broad phases. From its founding in 2006, the company was backed primarily by Bill Gates and developed out of the invention lab Intellectual Ventures, with its design evolving over time from the original traveling-wave reactor to today’s Natrium. Beginning in 2020, TerraPower was selected for the U.S. Department of Energy’s Advanced Reactor Demonstration Program, securing roughly $2 billion in federal cost-share support toward the Natrium demonstration plant. Most recently, in June 2025, the TerraPower closed a $650 million fundraise that brought in a new investor — Nvidia, via its venture arm NVentures, in its first energy investment — alongside existing backers Bill Gates and HD Hyundai; UBS acted as exclusive placement agent, and terms were not disclosed.
These financings bring TerraPower’s private capital raised to more than $1.4 billion, which together with the DOE cost-share gives the Natrium project more than $3.4 billion in combined backing. Named investors and backers include Bill Gates (chairman and largest individual backer), Nvidia / NVentures, HD Hyundai, and SK Inc. Reporting has placed TerraPower’s implied private valuation in the multi-billion-dollar range, but no confirmed post-money figure is available; secondary-market price quotes for TerraPower shares should be regarded as indicative only.
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Why Consider Investing In TerraPower
The information provided is intended for educational and informational purposes only. This does not constitute investment advice, a recommendation, or an offer to buy or sell any securities. Investment decisions should be made in consultation with a qualified financial professional who can assess your personal circumstances and objectives. Past performance does not guarantee future results, and all investing involves risk of loss.
Landmark Regulatory Milestone
The March 2026 NRC construction permit is a genuine de-risking event in an industry defined by regulatory difficulty. Receiving a federal permit to build a first-of-its-kind commercial advanced reactor places TerraPower ahead of most advanced-nuclear peers on the single hardest gate the sector faces. It does not guarantee commercial success, but it materially advances the project from concept toward construction.
Aligned with AI-Driven Energy Demand
Electricity demand from data centers and AI is projected to rise sharply through the end of the decade, and hyperscalers are actively seeking firm, carbon-free power. Natrium’s steady baseload output plus its storage-enabled load-following makes it well suited to that demand profile. Nvidia’s 2025 investment — its first in energy — and TerraPower’s data-center relationships signal that strategic buyers see the fit.
Deep and Diversified Capital Base
TerraPower combines marquee private backers (Bill Gates, Nvidia, HD Hyundai, SK) with roughly $2 billion in DOE cost-share support. This combined public-private funding structure provides unusual financial runway for a capital-intensive development project and signals strong institutional and government confidence in the Natrium program.
Strong Policy Tailwinds for Nuclear
Federal policy in 2026 is notably supportive of new nuclear deployment, including executive actions intended to accelerate reactor approvals and construction. A favorable regulatory and political environment can shorten timelines and improve the economics of first-of-a-kind projects — a meaningful tailwind for a company whose principal hurdles are regulatory and schedule-related.
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TerraPower Risk Factors
Note: This information is for informative purposes only and is not investment advice or a recommendation.
Investors considering an allocation to TerraPower should weigh the company’s milestones against a substantial set of risks. While TerraPower has secured an NRC construction permit, deep private and federal funding, and powerful sector tailwinds, it remains a pre-revenue, development-stage company building a first-of-its-kind reactor on a long timeline, with no publicly disclosed valuation or detailed financials. Before investing in TerraPower, potential investors should evaluate several critical risks and challenges (the following examples do not encompass all potential investment risks):
Execution, Construction, and Schedule Risk
First-of-a-kind nuclear projects are historically prone to cost overruns and schedule delays. TerraPower’s first Natrium plant is targeted for operation around 2030, and the path from a construction permit to a fully operational, revenue-generating reactor is long, complex, and capital-intensive. Construction problems, supply-chain constraints, or engineering setbacks could materially delay revenue and require additional capital, diluting existing holders.
Long Path to Revenue and Capital Intensity
TerraPower’s core reactor business does not yet generate meaningful revenue and will not for years. The company depends on continued private fundraising and federal cost-share to fund development. If capital markets tighten, federal support changes, or the company cannot raise on favorable terms, its development timeline and equity value could be adversely affected. This is a long-duration investment with no near-term cash flows from the flagship product.
Regulatory, Policy, and Public-Acceptance Risk
Although TerraPower has cleared a major NRC hurdle, nuclear projects remain subject to extensive ongoing regulatory oversight, licensing for operation, safety review, and the possibility of changing rules. The sector is also sensitive to shifts in political support, public sentiment about nuclear power, and community acceptance. A change in federal policy or a high-profile industry incident anywhere in the world could affect timelines, costs, and financing conditions.
Explore advanced nuclear and energy — categories central to TSG’s future-tech research coverage and subject to both meaningful opportunity and concentrated execution, regulatory, and capital risk.
The Future Outlook of TerraPower
TerraPower enters the back half of 2026 having cleared the single hardest gate in advanced nuclear: a federal construction permit for a first-of-a-kind commercial reactor. The Kemmerer, Wyoming project now moves into full construction, with operation targeted around 2030. With more than $1.4 billion in private capital, roughly $2 billion in DOE cost-share support, marquee backers including Bill Gates and Nvidia, and powerful demand and policy tailwinds, the company is among the best-capitalized and most-advanced players in its field.
Several catalysts are worth watching. The most immediate is construction progress at Kemmerer — whether TerraPower can build on cost and on schedule, which is the central test of the entire thesis. Beyond the first plant, the longer-term opportunity may lie in repeatable deployment: additional Natrium units in the U.S. and internationally, a maturing domestic HALEU fuel supply, the isotopes business, and potential dedicated reactor deployments for data centers and other large power buyers. Continued strategic investment from players like Nvidia, and any firm offtake agreements with hyperscalers, may be strong validation signals.
Longer term, the thesis rests on a clear but demanding bet: that the world’s need for firm, carbon-free power — amplified by AI — will create durable demand for advanced reactors, and that TerraPower’s Natrium design will prove buildable, affordable, and repeatable. If the company delivers the first plant and converts it into a deployable product line, the value-creation potential is large. But the timeline is long, the capital requirements are heavy, and the execution risk is real. The bear case — cost overruns, delays, fuel-supply gaps, or shifting policy — is equally concrete.
Be sure to read the full disclaimer below prior to considering any investment in TerraPower.
Frequently Asked Questions
Any mention of TerraPower in the FAQs does not imply that we offer opportunities in TerraPower to investors or have invested in TerraPower directly. We may or may not own a position in TerraPower, we may or may not provide TerraPower opportunities to investors, or both. Any mention of TSG Capital Advisors, TSG Invest funds, or any other TSG Invest-affiliate is for purposes of addressing the questions and does not imply that we have access to or recommend TerraPower as an investment.
The information provided is intended for educational and informational purposes only. This does not constitute investment advice, a recommendation, or an offer to buy or sell any securities.
How Can I Invest In TerraPower?
Investing in TerraPower stock typically requires accredited investor status. The process of buying TerraPower stock can be complex, influenced by factors like the availability of shares, the company’s openness to adjusting its cap table, and meeting minimum investment requirements. At TSG Invest, we specialize in facilitating pre-IPO private investment opportunities. Through our affiliates, we provide accredited investors with options to acquire shares like TerraPower directly via TSG Capital Advisors or explore ways to invest indirectly through pooled investment vehicles managed by our experienced fund managers. Discover streamlined access to pre-IPO private investment opportunities with TSG Invest.
Is TerraPower Publicly Traded?
TerraPower is a privately held company, and its shares are not available for purchase on public exchanges such as NASDAQ or NYSE. Accredited investors may potentially acquire TerraPower stock via a pre-IPO broker like TSG Capital Advisors or invest indirectly through pooled investment vehicles, such as those managed by TSG Invest fund managers.
When Will TerraPower IPO?
As of this writing, it is unknown when TerraPower will go public. The company has stated it will continue to be privately held and has not announced an IPO timeline. While some investors anticipate a TerraPower IPO given its landmark NRC permit, deep backing, and sector tailwinds, it is important to understand that an IPO is not the only type of liquidity event available for private companies. Other potential outcomes include acquisition, merger, or the company continuing to raise private capital. When evaluating a TerraPower IPO or similar venture-backed private companies, investors should also consider less favorable scenarios, such as the company remaining private indefinitely or facing construction, regulatory, or funding challenges. Stay informed about updates on a TerraPower IPO and other potential liquidity outcomes.
How Can I Buy TerraPower Stock?
TerraPower stock is only available via pre-IPO brokers and private market marketplaces. A pre-IPO broker, like TSG Capital Advisors (an affiliate of TSG Invest), can help accredited investors learn more about investing in TerraPower and buying TerraPower stock, including the TerraPower stock price, the latest news about a potential TerraPower IPO, and ways to invest in TerraPower indirectly. Examples include investing in TerraPower via pooled investment vehicles managed by TSG Invest fund managers.
Is It Possible To Invest In TerraPower Through ETFs or Mutual Funds?
Investing in TerraPower through an ETF or mutual fund is generally not possible, as private pre-IPO opportunities are typically not available through those channels. In the rare cases where an ETF or mutual fund does hold private company exposure, investors usually do not have the option to purchase TerraPower stock directly, have no control over share management, and the fund’s portfolio may include other holdings that could dilute exposure to TerraPower. To explore options for buying TerraPower stock directly or alternative ways to invest in TerraPower, contact TSG Invest today. For an overview of how private-market access works — including SPVs, feeder funds, and accreditation rules — please see our Pre-IPO Investing Guide.
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IMPORTANT DISCLAIMER FOR INVESTORS CONSIDERING INVESTING IN TERRAPOWER
The following material is provided by TSG Invest and its affiliates (collectively “TSG Invest”) for informational and educational purposes only. This material does not constitute an offer to sell securities or a solicitation to participate in any trading strategy. Investing inherently involves risk, including the potential loss of principal. Past performance does not guarantee future results, and market conditions can change rapidly. Different investments carry varying levels of risk. While content is compiled from sources believed reliable, TSG Invest cannot guarantee complete accuracy or completeness of information presented. All opinions, forecasts, and projections reflect our views as of the publication date. This material may contain preliminary information and forward-looking statements. Due to various factors, actual events may differ substantially from those presented. TSG Invest assumes no obligation to update forward-looking statements or opinions. TSG Invest, its officers, directors, employees, or clients may hold positions in mentioned securities or investments. Such positions may change at any time without notice. All opinions and market views are subject to change without notice. TSG Invest and its financial advisors do not provide legal, tax, or accounting advice. You should consult with legal and tax advisors before making any financial decisions. This material does not consider individual investment objectives, financial situations, or needs. Furthermore, TSG Invest does not monitor ongoing suitability, provide personalized recommendations without a formal agreement, or determine if content suits individual readers. Receipt of this material does not create an advisory relationship. Professional financial advice is recommended for your specific situation. Investors should carefully review all risks and consider their investment objectives, resources, and risk tolerance before making investment decisions. No assurance can be given that any specific investment or strategy will be profitable or suitable for any specific investor’s portfolio. Asset allocation, rebalancing, and diversification strategies do not guarantee against risk in broadly declining markets. This material is not intended as a recommendation, offer, or solicitation for the purchase or sale of any security or investment strategy. TSG Invest (d/b/a of The Spaventa Group LLC) is not a registered broker-dealer nor investment advisor. TSG Invest refers certain financial services to its affiliated broker-dealer, TSG Capital Advisors LLC (“TSGCA”) (Member FINRA/SIPC), its wholly owned registered investment advisor subsidiary, TSG Alpha Partners LLC (“TSGA”), and its wholly owned insurance agency subsidiary, TSG Insurance Services LLC (“TSGIS”). Financial Planning and Investment Advisory Services offered through TSG Alpha Partners LLC (CRD #319493). Private placements offered through TSG Capital Advisors (CRD #147509), member FINRA, SIPC. Insurance products offered through TSG Insurance Services LLC. TSG Alpha Partners, TSG Capital Advisors, and TSG Insurance Services are affiliated due to common ownership. These affiliates may take positions contrary to those discussed in this material. Private placements discussed herein are especially high-risk and illiquid investments typically only available to accredited investors under Regulation D. These securities are subject to holding period requirements, and not all private companies will succeed or go public. Independent due diligence is essential, and investors should be prepared for the possibility of total loss of investment.
RISK FACTORS RELATED TO ADVANCED NUCLEAR AND ENERGY INVESTMENTS
Investments in companies developing or deploying advanced nuclear and energy technologies are subject to significant risks that could result in the loss of some or all of your investment. Advanced nuclear projects are highly capital-intensive, long-duration, and first-of-a-kind in nature, and are historically prone to cost overruns and schedule delays. Companies in this sector may be adversely affected by construction and engineering challenges, supply-chain constraints (including the availability of specialized nuclear fuel such as high-assay low-enriched uranium), and the inability to scale deployment consistent with projections. The regulatory landscape for nuclear energy is extensive and evolving; reactor licensing, construction permits, operating approvals, safety reviews, and changing federal, state, and international rules could materially impact operations, increase costs, or delay or prevent commercial operation. Companies depending on government programs and cost-share funding face exposure to federal budget cycles, policy changes, and shifting political priorities; loss or reduction of government support could have an outsized effect on timelines and valuation. Nuclear energy is also subject to public-acceptance risk, and a high-profile safety incident anywhere in the industry could affect sentiment, regulation, and financing conditions broadly. Development-stage energy companies typically generate little or no revenue from their flagship technology for years and depend on continued access to private and public capital; difficulty raising funds on favorable terms could impair development or dilute existing investors. Market valuations of private nuclear and energy companies may be influenced by sector sentiment, strategic-investor dynamics, or industry enthusiasm rather than fundamental factors, potentially leading to volatile or unreliable secondary-market pricing that may not reflect underlying business value, particularly where no valuation has been publicly disclosed. Success depends on the ability to attract and retain highly skilled nuclear engineers, scientists, and construction personnel in a competitive and specialized labor market. These risk factors are not exhaustive, and other unknown or unpredictable factors could also have material adverse effects on the performance of advanced-nuclear- and energy-focused investments.
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